首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   728784篇
  免费   50771篇
  国内免费   1348篇
耳鼻咽喉   9519篇
儿科学   23850篇
妇产科学   18250篇
基础医学   113359篇
口腔科学   20422篇
临床医学   66265篇
内科学   139468篇
皮肤病学   16423篇
神经病学   51833篇
特种医学   26475篇
外国民族医学   77篇
外科学   108310篇
综合类   15128篇
现状与发展   2篇
一般理论   178篇
预防医学   52937篇
眼科学   16812篇
药学   55279篇
  3篇
中国医学   2370篇
肿瘤学   43943篇
  2021年   6263篇
  2019年   6097篇
  2018年   8647篇
  2017年   6621篇
  2016年   7357篇
  2015年   8170篇
  2014年   11133篇
  2013年   16421篇
  2012年   22064篇
  2011年   23070篇
  2010年   13570篇
  2009年   12694篇
  2008年   21202篇
  2007年   22681篇
  2006年   22984篇
  2005年   21414篇
  2004年   20865篇
  2003年   19711篇
  2002年   19151篇
  2001年   36657篇
  2000年   37226篇
  1999年   30639篇
  1998年   8010篇
  1997年   6800篇
  1996年   7087篇
  1995年   6727篇
  1994年   6196篇
  1992年   23197篇
  1991年   23169篇
  1990年   22570篇
  1989年   22347篇
  1988年   20303篇
  1987年   19685篇
  1986年   18707篇
  1985年   17572篇
  1984年   12912篇
  1983年   10894篇
  1982年   6055篇
  1979年   11712篇
  1978年   8288篇
  1977年   6958篇
  1976年   6708篇
  1975年   7354篇
  1974年   8645篇
  1973年   8273篇
  1972年   7766篇
  1971年   7229篇
  1970年   6981篇
  1969年   6398篇
  1968年   5837篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
A true comparison of long-term medical and surgical treatment in gastro-oesophageal reflux disease (GORD) is impossible as few studies have been carried out with adequate randomisation of the patients and long-term evaluation of quality of life. In general the control of the reflux symptoms is roughly equal with medical and surgical treatment. However, surgery can cause other symptoms such as dysphagia or non-specific epigastric discomfort or pain in some patients, which reduces the overall efficacy in controlling the symptoms. Based on a cost utility analysis, Heudebert et al. came to the conclusion that medical treatment was their preferred strategy for most patients with severe erosive oesophagitis.  相似文献   
62.
63.
A total of 50 consecutive patients who were treated in JIPMER Hospital between 1970 and 1981 for corrosive injuries of the oesophagus and stomach were analysed. There were 23 males and 27 females. All but seven presented with dysphagia due to an established stricture. In addition seven of them had associated stricture of the stomach. They were treated with either repeated dilatations or, in selected cases, oesophageal replacement. Perforation of the oesophagus is an important complication associated with oesophageal dilatation indicating the need for oesophageal replacement in multiple or long dense strictures. Results are quite satisfactory with both modalities of treatment. However, oesophageal replacement surgery, performed properly in selected cases, offers a permanent solution to these unfortunate victims.  相似文献   
64.
Clinical versus ultrasonographic evaluation of scrotal disorders   总被引:1,自引:0,他引:1  
Clinical and ultrasonographic examinations of scrotal disorders were compared in 166 patients in order to determine their ability to distinguish between those diseases requiring surgery and those requiring clinical follow-up only. Ultrasound examinations were efficient in discriminating between normal and pathological findings. Extra-testicular lesions were readily differentiated from testicular ones. Although both clinical and ultrasonographic examinations had high sensitivity (90%) in detecting testicular cancer, the number of false positive findings was smaller after ultrasound examination. This gave a predictive value of a positive test of 53% after ultrasound examination but only 33% after clinical examination. Ultrasound examination may, therefore, reduce the number of surgical explorations in the scrotum and should be performed in patients with suspected testicular pathology based on history and palpatory findings.  相似文献   
65.
66.
Background.Computers that collect data from patients and provide both patients and practitioners with printed feedback on a range of health risks are a tool for assisting general practitioners with preventive care. This study assessed the impact of computer-generated printed feedback on cervical screening among women who were underscreened for cervical cancer.Method.Female attenders at two Australian general practices were randomly allocated to Experimental or Control groups. Women in both groups completed a health risk survey on a touch screen computer prior to their consultation. Those in the Experimental group received printed pages summarizing their results, including their eligibility for cervical screening and last Pap test, for themselves and their doctor. The number and proportion of underscreened women who had a Pap test in the 6 months after completing the computer survey, as determined by pathology records, were examined.Results.Of the 679 participants, 139 were classified as underscreened on the basis of self-report (74 Experimental, 65 Control) and 272 on the basis of their pathology records (148 Experimental, 124 Control). Overall about one-third of women had a test in the 6-month period, and the differences between the groups were not significant for women overall (18–70 years) or for women 18–49 years. Among women 50–70 who were underscreened based on self-report, those receiving the printout were more likely to have a Pap test in the next 6 months (P< 0.05). This pattern was also evident, but did not reach statistical significance, for older women who were underscreened based on pathology records.Conclusions.We are unable to draw conclusions regarding the effectiveness of the computer system due to the modest proportions of women screened, the small numbers, and the fact that the computer survey may have created an intervention effect in the Control group. As the study suggests the computer system is acceptable to women and may be effective for encouraging screening among older women, further exploration of the system is desirable.  相似文献   
67.
In this paper, the authors describe some of the complexities of collecting and presenting data on race and ethnicity based on the experiences of the Bureau of the Census. Different methods of data collection, different content and format of questions, and different definitions make it difficult to collect consistent race and ethnic data across data systems. The Bureau of the Census experiences have shown that changing ethnic self-identity and concepts, intent of the question, consistency of reporting, and the classification of persons of mixed racial parentage affect the quality of the data. These are some of the issues that must be addressed as statistical agencies and researchers seek to provide comparable race and ethnic data.  相似文献   
68.
69.
70.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号